Gypsum, Drywall & Interior Panel Manufacturing calculator

Stacker Capacity Calculator

Estimate stacker capacity by entering boards per stack, stacks per shift, stacker uptime, and quality yield. The result shows good boards per shift rather than the nameplate rate, accounting for mechanical downtime and inspection rejects.

What this calculator does

  • Estimate end-of-line stacker output for a shift by combining boards per stack, stacks per shift, stacker uptime, and quality yield.
  • Use it when the board line is increasing speed and you need to confirm the stacker can keep pace without creating a backlog at the end of the dryer.
  • The result estimates good boards per shift that the end-of-line stacker can deliver at the entered stack size, cycle rate, uptime, and yield.

Formula used

  • Gross stacker output = boards per stack x stacks per shift
  • Good boards per shift = gross output x stacker uptime x quality yield

Inputs explained

  • Boards per stack: undefined
  • Stacks per shift: undefined
  • Stacker uptime: undefined
  • Quality yield: undefined

How to use the result

  • Use it when reviewing stacker capacity before a board line speed increase or a new board thickness changeover.
  • It remains an estimate when stacker cycle time varies by board thickness, uptime is affected by intermittent jam faults, or quality yield changes between board grades.

Common questions

  • What is stacker capacity in drywall manufacturing? Stacker capacity is the number of good boards the end-of-line stacker can handle per shift. It sets the maximum rate at which finished boards can be moved from the dryer exit to the warehouse or shipping dock.
  • What data should I enter? Use boards per stack from the current stacker recipe, stacks per shift from recent shift logs, stacker uptime from maintenance records, and quality yield from the end-of-line inspector report.
  • When is the result only an estimate? It remains an estimate when stacker cycle time varies by board size, uptime differs between product grades, or quality yield changes due to dryer settings or stucco formulation.
  • What decision can this support? Use the result to confirm stacker capacity before a line speed increase, then validate with the production engineer and maintenance team before committing the new target.

Last reviewed 2026-05-12.